At first I thought this soda can sized device was an ultrasonic sound mosquito repellent, but I was pleasantly surprised to discover the battery powered accessory utilizes plant-derived essential oils to naturally repel annoying warm weather bugs. Instead of a loud bug zapper, the tabletop repeller uses the cocktail of floral scents of geranium, peppermint and lemongrass to lightly perfume the air while creating a safe insect-free perimeter mosquitos, gnats, and midges find as annoying as you find their buzz in your ear and bites on your rear.